Notes storage / encryption

[Tschoka]

I have searched but have not found anything suitable. Sorry if this topic has already been discussed - I'm hoping for more information:
The notes of the QucikNotes app seem to be stored in the app folder. Is it true that the notes are therefore not encrypted? Is it possible to put the notes in the file folders as well or add this feature?

[ViVlVl]

Maybe it's a good idea to encrypt notes with important ones, rather than the entire storage?